Elsevier, Chemical Physics Letters, 5-6(332), p. 435-441
DOI: 10.1016/s0009-2614(00)01316-6
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In order to simulate disorder effects in thin films, model calculations of the absorption spectrum are performed for a statistical ensemble of differently oriented sexithiophene microcrystals. The assumed distribution of crystallite orientations is based on available experimental data. The directional dependence of the non-analytic part of dipole lattice sums is identified as the leading broadening mechanism; other contributions to broadening are also discussed.